Posted for no particular reason other than I found it interesting.
http://www.canadianrockies.net/dogs/...-for-pets.html
In Jasper National Park – Dogs and Wildlife
Dogs are required to be on a leash at all times within the park, for both their own protection and to protect the park’s wildlife. Outside the park, the “stoop and scoop” laws are stringently followed so make sure to clean up after your dog.
Predators – Bears, Cougars, Wolves, Coyotes
Lions, Tigers and Bears, oh my! Wildlife can pose a hazard to dogs, and vice versa. Dogs can make a nice snack for a grizzly bear, wolf, coyote or cougar. It is even more dangerous for animals than humans because when a dog running at large encounters a predator, the predator may react either defensively (to protect itself) or aggressively (to kill/eat the dog). The dog may also run back to his owners for safety, bringing the predator back with him!
You don't want your dog bringing one of these guys back to camp.
In fact, an incident like this happened in the summer of 2006 when a dog was trailed back to the camp by an angry black bear. The result was almost fatal, but the dog’s owners got away with only scratches and a bite on the thigh. In another incident a bighorn sheep headbutted a dog, who was acting in a threatening manner, off a cliff.
Although dogs and coyotes often seem to play together, sometimes things can take a far less cute turn. Coyotes have been known to lure the dog away from its owners to kill it.
These rules are there for a good reason and park wardens have the authority to shoot a dog on sight if it is running loose and harassing wildlife.